Styled like your favorite casual shades but engineered for the trail, the FKT Mineral King sunglasses deliver the performance you need on your toughest runs. FKT set its premium shatterproof lenses inside a lightweight, durable frame made of recycled nylon. The polycarbonate lenses deliver 100% UVA/UVB protection and blue light filtration, while maintaining uncompromised clarity and contrast for variable light conditions. Inspired by the 36.3-mile Mineral King Loop in the Mineral King Valley of Sequoia National Park, FKT designed these shades to perform just as well on the trail as they do at the campsite.. Why aren’t FKT’s lenses polarized? Because polarization isn’t what a trail athlete needs. Polarization cuts glare if you’re on the water or snow, but it can cause depth perception issues if you’re running on a trail with variable light conditions. Details Adjustable no-slip-grip temples No-slip-grip nose piece Premium lightweight recycled Bioptix nylon blend frame Trail vision technology lenses Includes FKT case, pouch and microfiber cloth